If you have access to Radiance, additional daylight dimming energy savings are available using Radiance sensors.
In Radiance click on the Sensors tab, place sensors in all rooms that will have a daylight dimming control, then click the Apache button at the bottom of the screen to run the calculation.
Next you want to create a new profile to control the lighting based on the sensed luminance, there is an example of this in the ApPro User Guide but the variable for sensed luminance is e1 (example formula profile might be "RAMP(e1,0,1,500,0.3)" so lights would be fully on when there is no light and gradually reduce to 30% when the sensed illuminance level 500lux is reached). Next this profile needs to be applied to the lighting internal gain (in the thermal template or room data) as the dimming profile.
When you run the apache simulation make sure the Radiance link is ticked on and you should see the effect of the dimming reducing lighting gains.
If you do not have a Radiance license, a similar effect can be achieved by approximating the Dimming Profile based on expected lighting levels, and applying the profile to the internal lighting gain. Another option is to apply a diversity factor to the lighting gain in question, where the amount of savings taken will need to be justified during assessment; as a general guideline, 10% savings is an acceptable value for a well-designed daylight sensor strategy.
